JPH1089401A - Vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize the sealing of a bulkhead member, and make its size in diameter direction compact by eliminating caulking portions circumferencially protruding. SOLUTION: An elastic body 18 is attached between an upper mounting member 24 and an outer cylinder mounting hardware 16. The outer cylinder mounting hardware 16 has a first cylinder section 16B and a second cylinder section 16C. An engaging section 16E made by projecting the circumference of the outer cylinder mounting hardware 16 into its inner circumferential side is provided between these cylinder section 16B and 16C. The outer cylinder mounting hardware 16 is inserted into a bracket 12 in a manner that the first outer cylinder mounting hardware 16 is closely fitted to the bracket 12. A pair of liquid rooms 32A and 32B are sealed by a bulkhead member 34 by drawing the second cylinder section 16C of the outer cylinder mounting hardware 16 and closely contacting and fitting the thin area of the elastic body 18 to the bulkhead member 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration device for preventing transmission of vibration from a vibration generating section, and more particularly to a mount for supporting a member such as an engine which generates vibration. Applicable.

[0002]

2. Description of the Related Art For example, a vibration isolator as an engine mount is provided between an engine serving as a vibration generating portion of a vehicle and a vehicle body serving as a vibration receiving portion. Is absorbed and is prevented from being transmitted to the vehicle body.

[0003] That is, as this vibration isolator, there is known one in which an elastic body and a pair of liquid chambers are provided inside the vibration isolator, and these liquid chambers are communicated with each other through a restricted passage serving as an orifice. When the mounted engine operates and generates vibration, the vibration is absorbed by the vibration damping function of the elastic body and the viscous resistance of the liquid in the orifice communicating with these liquid chambers, and the vibration is transmitted. It is designed to block.

As one example, a vibration isolator 110 as shown in FIGS. 5 and 6 is known, and will be described below.

[0005] As shown in these figures, an outer cylinder fitting 120 is provided.
A rubber elastic body 118 is provided between the
Are vulcanized and bonded to these fittings. Further, an outer cylinder fitting 120 is inserted into the bracket 114, and the rebound stopper fitting 112 is swaged to the bracket 114.

[0006] A liquid chamber 124 is provided between the diaphragm 122 and the elastic body 118 disposed in the outer cylinder 120, and the liquid chamber 124 is formed by a pair of liquid chambers 124A and 124A.
A partition member 130 having a partition 4B and having an orifice 132 is provided in the liquid chamber 124.

Therefore, the vibration isolator 110 is provided in both the liquid chambers 1.
The liquid in both liquid chambers 124A and 124B circulates through orifice 132 communicating with 24A and 124B to reduce vibration.

[0008]

However, when assembling the conventional vibration isolator 110 as described above, the outer cylinder fitting 12
When the entire outer periphery of the outer cylinder 0 is inserted so as to be pressed into the bracket 114, a large force is applied to the outer cylinder fitting 120, so that the partition member 130 and the like are deformed and deteriorated, and accordingly, the liquid chamber formed by the partition member 130. There is also a possibility that the sealing property of the stencil may deteriorate.

As a countermeasure, the lower part 120B of the outer cylinder 120 is not pressed into the upper part 120A, but is inserted into the bracket 114 in a state where only the upper part 120A is press-fitted into the bracket 114. An assembling method was considered in which the lower portion 120B of the outer cylinder fitting 120 and the bracket 114 were appropriately coupled by processing to perform sealing.

However, in this case, the outer tube fitting 1 shown in FIG.
The lower part 120B of 20 is inclined to the inner peripheral side as shown by a two-dot chain line due to the influence of the upper part 120A of the outer cylindrical fitting 120, and the lower part 120B does not deform smoothly. For this reason, the partition member 1
As the ratchet 30 rattles inside the outer cylindrical fitting 120, the partition member 130 does not sufficiently seal the pair of liquid chambers 124A and 124B, or the liquid chamber 124 itself does not sufficiently seal. The liquid in the chamber 124 may leak to the outside.

In addition, during assembly by these methods, the position of the partition member 130 is regulated only by the step 118A of the elastic and soft elastic body 118.
At the time of sealing between the pair of liquid chambers 124A and 124B by 0, the partition member 130 moves in the vertical direction in the drawing, or the partition member 130 rides on the elastic body 118. Therefore, it is difficult to stabilize the seal between the pair of liquid chambers 124A and 124B by the partition member 130.

On the other hand, as a countermeasure, as shown in FIG. 8, the outer cylinders are formed as a pair of outer cylinders 220A and 220B, and a partition member 230 having an orifice 232 is swaged between the pair of outer cylinders 220A and 220B. Processing and liquid chamber 2
An anti-vibration device 210 having a structure to be arranged in the inside 24 was considered.
However, in this vibration isolator 210, the seal portion 230A of the partition member 230 is arranged on the outer peripheral side of the vibration isolator 210,
Since the sealing is performed by swaging, the swaged portion protrudes to the outer peripheral side of the vibration isolator 210.

The present invention has been made in consideration of the above-described facts, and has as its first object to provide a vibration damping device in which sealing performance is stabilized by a partition member. A second object is to provide an anti-vibration device that is compact in the direction.

[0014]

According to a first aspect of the present invention, there is provided an anti-vibration device comprising: a first mounting member connected to one of a vibration generating portion and a vibration receiving portion; and a first mounting member formed in a tubular shape. A second mounting member that has an engaging portion that is located on the outer peripheral side and protrudes toward the inner peripheral side in the middle of the axial direction, and an elastic body interposed between the pair of mounting members, A liquid chamber in which at least a part of an inner wall is formed of the elastic body and in which a liquid is sealed, and an outer peripheral side is engaged with an engaging portion of the second mounting member to be positioned in the axial direction while being positioned in the liquid chamber. A partition member having an orifice disposed to partition the liquid chamber into a pair of small liquid chambers and communicating with the pair of small liquid chambers; The mounting member is press-fitted and the pair of mounting members and the elastic body are housed therein. And having socket and, a.

According to a second aspect of the present invention, in the vibration isolator according to the first aspect, a portion of the pair of portions of the second mounting member, which sandwiches the engaging portion along the axial direction, is connected to the bracket. The distal end side in the press-fitting direction is smaller in diameter than the base end side in the press-fitting direction to the bracket.

The operation of the vibration isolator according to claim 1 will be described below. An elastic body is interposed between the first mounting member and the second mounting member, and a liquid chamber in which liquid is sealed is formed by an inner wall at least partially formed by the elastic body. The partition member disposed in the liquid chamber and dividing the liquid chamber into a pair of small liquid chambers has an orifice communicating the pair of small liquid chambers, and the second mounting member is press-fitted into the bracket. The pair of mounting members and the elastic body are housed in the bracket.

Accordingly, when vibration is transmitted from the vibration generating portion connected to the first mounting member, the elastic body is deformed, and the liquid chamber expands and contracts accordingly, and the liquid in the orifice of the partition wall member is changed. The pressure is changed and the flow is generated, and the vibration is attenuated by the deformation of the elastic body and the pressure change and the flow of the liquid, so that the vibration is hardly transmitted to the vibration receiving portion side.

Further, since the second mounting member formed into a cylindrical shape has an engaging portion protruding inward in the middle in the axial direction, the outer peripheral side is engaged with the engaging portion. The partition member is positioned in the axial direction, and the installation position of the partition member in the liquid chamber is stabilized, and the partition member reliably seals the space between the pair of small liquid chambers. Furthermore, since the partition member is arranged inside the vibration isolator and does not protrude outside the second mounting member, it is possible to reduce the radial size of the vibration isolator.

On the other hand, the outer diameter of the second mounting member is reduced so as to seal between the pair of small liquid chambers by the partition member. Not only makes it possible to draw only one of the axial direction of the second mounting member sandwiching the engaging portion, but also makes the engaging portion extend so that the second mounting member becomes elongated. The part of the member that is not drawn is easily deformed independently,
This facilitates drawing of the mounting member, and makes it possible to reduce the diameter of the seal portion along the axial direction substantially uniformly. Therefore, the seal between the pair of small liquid chambers by the partition member and the seal of the liquid chamber with respect to the outside are not insufficient as in the related art.

The operation of the vibration isolator according to claim 2 will be described below. The present invention has the same function as the first embodiment. However, in the present invention, the second portion in which the engaging portion is sandwiched along the axial direction.
The distal end side of the pair of parts of the mounting member in the press-fitting direction into the bracket is made smaller in diameter than the base end side in the press-fitting direction into the bracket. In other words, by providing a difference in the outer diameter dimension, the base end side in the press-fitting direction is a fitting portion by press-fitting with the bracket, and the front end side in the press-fitting direction is used to secure the sealing property between the pair of small liquid chambers by the partition member. The role of the seal on the second mounting member can be distributed.

This makes it possible to eliminate the load on the sealing portion when the second mounting member is pressed into the bracket.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 4 show a first embodiment of a vibration isolator according to the present invention, and the present embodiment will be described with reference to these drawings.

As shown in FIG. 1 showing the present embodiment, one of the mounting members of the vibration isolator 10 is constituted by an outer tube fitting 16 formed in a cylindrical shape. The outer tube fitting 16 includes a first cylindrical portion 16 </ b> B formed in a cylindrical shape and a first cylindrical portion 1.
The outer diameter of the first cylindrical portion 16B is slightly smaller than the outer diameter of 6B.
And a second cylindrical portion 16 </ b> C formed in a cylindrical shape on the lower side.

The outer peripheral surface of the outer cylindrical member 16 is depressed over the entire circumference at a position in the axial middle of the outer cylindrical member 16 between the first cylindrical portion 16B and the second cylindrical portion 16C. An engaging portion 16E projecting to the peripheral side is provided by press working or the like. Further, a disc-shaped flange portion 16A is formed at an upper end portion of the outer tube fitting 16, and a tapered portion 16D which is contracted in a tapered shape is connected to a lower end portion of the outer tube fitting 16.

The outer tube fitting 16 is formed in a cup shape, and has a flange portion 12A extending to the outer periphery press-fitted into a bracket 12 formed at an upper portion thereof, and is disposed in the bracket 12. In other words, the portion of the bracket 12 facing the upper side of the bracket 12 facing the first cylindrical portion 16B of the outer cylindrical member 16 is the upper cylindrical portion 12B closely fitted to the first cylindrical portion 16B. A lower cylindrical portion of the bracket 12 facing the second cylindrical portion 16C is formed to have a slightly smaller diameter than the upper cylindrical portion 12B and has a small amount of clearance (not shown) with the second cylindrical portion 16C. Have been.

As shown in FIGS. 2 and 3, a pair of U-shaped legs 14 are provided on the outer peripheral side of the bracket 12 so as to protrude toward the outer peripheral side of the bracket 12. I have.

The outer peripheral surface of a rubber elastic body 18 which is formed in a cylindrical shape and has an inter-ring 20 embedded therein is vulcanized and bonded to the inner peripheral surface of the outer cylindrical member 16. 16 surrounds and holds the elastic body 18. The portion of the elastic body 18 corresponding to the second cylindrical portion 16C of the outer cylindrical member 16 is a thin portion 18A which is made thin.

Further, a conical upper mounting member 24 made of metal and formed in a conical shape is buried in the center of the elastic body 18 while being vulcanized and bonded. The upper end of the upper mounting member 24 is elastic. It protrudes from the body 18. The upper mounting member 24 is provided with a screw hole 24A in which a female screw is formed, and a detent pin 25 is mounted.

As described above, the elastic body 18 is attached to the bracket 12 by being interposed between the upper attachment member 24 serving as the first attachment member and the outer tube fitting 16 constituting the second attachment member. The outer tube fitting 16 is press-fitted, and the outer tube fitting 16, the upper mounting member 24, and the elastic body 18
It is housed in the bracket 12.

The stopper rubber 2 is located above the upper mounting member 24 and at a position facing the top surface of the upper mounting member 24.
An arm bracket 26 is provided via the second bracket 2. That is, in the cylindrical stopper rubber 22, the prism 2 forming the base end side of the arm bracket 26 formed of an iron casting or the like is formed.
6A is press-fitted. A hole 22A is formed in the upper wall of the stopper rubber 22, an opening 22B is formed in the lower wall of the stopper rubber 22, and a through hole 27A is formed in the prism 26A.

Therefore, the hole 22A formed in the upper wall of the stopper rubber 22 and the through hole 27A formed in the prism 26A are formed.
A stopper bolt 28 is inserted from above into an opening 22B formed in the lower wall of the stopper rubber 22, and the stopper bolt 28 is screwed into a screw hole 24A of the upper mounting member 24, so that the arm bracket 26 is moved upward. Mounting member 24
It is fixed to.

Further, a plurality of bolt holes 27B for connecting the arm bracket 26 to an engine (not shown) serving as a vibration generating portion are provided at the tip end side of the arm bracket 26.
Are formed. Therefore, the upper mounting member 24 protruding from the elastic body 18 is used for connection to the engine, and the upper mounting member 24 is connected to the engine serving as a vibration generating unit via the arm bracket 26. .

Above the upper mounting member 24, a rebound stopper fitting 60 for restricting the displacement of the upper mounting member 24 within a certain range is disposed to face the upper mounting member 24 via the arm bracket 26. ing. FIG.
Upper and lower ends of the rebound stopper fitting 60 formed in an inverted U-shape are pressed into the pair of legs 14.

Through holes 14A and 60A are formed at both ends of the rebound stopper fitting 60 and the leg 14, respectively. The through holes 14A and the rebound of the leg 14 are formed by a pair of set screws 64 shown in FIG. The through hole 60 </ b> A of the stopper fitting 60 is integrally penetrated and fastened to the vehicle body 62 serving as a vibration receiving portion, and the vibration isolator 10 is fixed to the vehicle body 62.

On the other hand, a rubber diaphragm 30 is provided on the inner peripheral surface.
Is vulcanized and bonded to the second cylindrical portion 16C.
It fits inside and is fixed.

A liquid chamber 32 having an inner wall formed by these members is provided between the diaphragm 30 and the elastic body 18, and a liquid such as water or oil is sealed therein. In the liquid chamber 32, a partition member 34 made of, for example, a synthetic resin material is provided.
The liquid chamber 32 is fitted to the inner wall surface of the main body 8A and the outer peripheral side is engaged with the engaging portion 16E to be positioned and arranged in the axial direction. It is divided into two sections with the sub liquid chamber 32B.

Further, at the center of the partition member 34,
A circular opening 38 is formed, and a groove 36 formed in a groove shape is formed substantially along the outer peripheral end 34B inside the outer peripheral end 34B which is the outer peripheral surface of the partition member 34. Have been. At one end of the groove 36, a small hole 52 communicating the main liquid chamber 32A and the inside of the groove 36 is formed, and at the other end, a small hole 54 communicating the sub liquid chamber 32B and the inside of the groove 36 is formed. Is formed. Therefore, the elastic body 1
8, the groove 36 and the small hole 52 closed by the inner wall surface,
54 constitutes the orifice 42 communicating between the main liquid chamber 32A and the sub liquid chamber 32B.

Further, the diaphragm 30 and the bracket 1
An air chamber 44 is formed between the diaphragm 30 and the bottom wall of the diaphragm 30.
Is possible.

On the other hand, a rib 34A projecting upward from the opening 38 is formed in the partition member 34, and a membrane 46, which is an elastic plate whose central portion protrudes in a circular shape, is engaged with the rib 34A. ing.

In the lower part of the membrane 46 near the outer periphery, the outer peripheral end is formed by the diaphragm 30 and the partition member 34.
And a circular metal plate 48 protruding in a circular shape so that the central portion is fitted into the opening portion 38, and the membrane 46 is sandwiched between the ribs 34A. ing. In addition, a hole is provided at the position of the disk 48 corresponding to the small hole 54 as shown in the figure.

Next, a procedure for manufacturing the vibration isolator 10 according to the present embodiment will be described. First, the first cylindrical portion 16B, the second
Outer tube fitting 16 having cylindrical portion 16C, engaging portion 16E, etc.
Is formed by press working, the upper mounting member 24 and the outer tube fitting 16 are placed in a mold, and the elastic body 18 is vulcanized. Then, in the liquid, the membrane 46, the disc 4
8 and diaphragm member 34 and diaphragm 3 with attached
0 and the like are inserted into the outer cylindrical member 16, and the outer peripheral side of the partition member 34 is engaged with the engaging portion 16 </ b> E of the outer cylindrical member 16 to thereby form the partition member 34.
The second cylindrical portion 16C of the outer cylindrical member 16 is drawn while the axial position of the outer cylindrical member 16 is being drawn, and the lower end portion of the outer cylindrical member 16 is caulked to form a tapered portion 16D. Thereby, not only these members are accommodated in the outer tube fitting 16, but also
The thinned portion 18A of the elastic body 18 and the partition member 34
Are tightly contacted with each other to form a pair of liquid chambers 32A, 3A.
The space between 2B is sealed by the partition member 34, and a state as shown in FIG. 4 is obtained.

Then, the prism 26A of the arm bracket 26 is pressed into the stopper rubber 22, and the stopper rubber 2 is pressed.
The arm bracket 26 is fixed to the upper mounting member 24 by inserting a set bolt 28 through the arm bracket 26 and the arm bracket 26.

Next, the outer cylindrical member 16 is press-fitted into the bracket 12, and the upper mounting member 24, the outer cylindrical member 16 and the elastic member 1 are pressed.
8 is housed in the bracket 12, and both ends of the rebound stopper fitting 60 are press-fitted into a pair of legs 14 formed to protrude from the bracket 12, and the rebound stopper fitting 60 is temporarily fixed to the pair of legs 14. Then, the assembly is completed as shown in FIGS.

That is, the bracket 1 of the outer tube fitting 16
At the time of press-fitting into the bracket 2, the outer cylinder 16 is inserted into the bracket 12, but the second cylindrical portion 16C of the outer cylinder 16 is formed to have a slightly smaller diameter than the lower cylindrical portion 12C of the bracket 12, so that the second cylinder 16C is smoothly moved halfway. The outer tube fitting 16 is inserted into the outer case. Then, the first cylindrical portion 16B of the outer cylindrical member 16 and the upper cylindrical portion 12B of the bracket 12 are press-fitted, tightly fitted, and fixed to each other.

Thereafter, the vibration isolator 1 thus completed is completed.
0 is installed in the vehicle, and a pair of setscrews 64 are passed through both ends of the pair of legs 14 and the rebound stopper fitting 60 and fastened to the vehicle body 62, as shown in FIG.
The bracket 12 connected to the pair of legs 14 and the rebound stopper fitting 60 are fixed to the vehicle body 62, and the vibration isolator 10
Can be mounted on the vehicle body 62. Then, bolts (not shown) are fastened to the plurality of bolt holes 27B of the arm bracket 26 to connect the arm bracket 26 to the engine.

Next, the operation of the present embodiment will be described. When an engine mounted on the upper mounting member 24 via the arm bracket 26 operates, vibration of the engine is transmitted to the elastic body 18 via the arm bracket 26 and the upper mounting member 24.

The elastic body 18 acts as a vibration absorbing main body, and can absorb vibration by a vibration damping function based on internal friction of the elastic body 18. Further, the main liquid chamber 32A and the sub liquid chamber 3
The liquid in 2B circulates through orifice 42 to each other,
The damping effect based on the pressure change of the liquid generated in the orifice space, the viscous resistance of the liquid flow, and the like can improve the vibration isolation effect.

On the other hand, even when the orifice 42, which can only reduce the frequency range in a narrow range, is clogged and vibration is not sufficiently reduced by the orifice 42 alone, for example, when high-frequency vibration is transmitted, the membrane 46 can be used. Is not elastically deformed and the internal pressure in the liquid chamber 32 does not increase. As a result, even if high-frequency vibration that cannot be reduced by the orifice 42 is generated, the orifice 42 becomes a low dynamic spring, the vibration isolating characteristics are maintained without being reduced, and the effect of the vibration isolating device 10 is sufficiently exhibited.

On the other hand, when vibration of excessive amplitude is input from the engine, the rebound stopper fitting 60 disposed opposite the outer fitting 16 limits the displacement of the outer fitting 16 to a certain range. Will do.

Further, the outer cylindrical member 16 is press-fitted into the bracket 12, and the outer cylindrical member 16, the upper mounting member 24 and the elastic body 18 are stored in the bracket 12. The outer cylindrical member 16 has an engaging portion 1 protruding inward in the middle in the axial direction.
6E, the partitioning member 3
4 engage with each other to position the partition member 34 in the liquid chamber 32 in the axial direction, stabilize the installation position of the partition member 34 in the liquid chamber 32, and use the partition member 34 to form a pair of liquid chambers. The space between 32A and 32B is securely sealed. Further, since the partition member 34 is arranged inside the vibration isolator 10 and does not protrude outside the outer tube fitting 16, the vibration isolator 10 can be made compact in the radial direction.

On the other hand, at the time of assembling the vibration isolator 10, the second cylindrical portion 16C of the outer tube fitting 16 is drawn and processed.
Sealing between the liquid chambers 32A and 32B by the partition member 34 is achieved. However, by providing the engaging portion 16E protruding inward on the outer cylindrical member 16, only the second cylindrical portion 16C which is one of the axial directions of the outer cylindrical member 16 sandwiching the engaging portion 16E is provided.
The drawing process can be performed without being affected by the first cylindrical portion 16B due to the extension of the engaging portion 16E, and the drawing process of the outer tube fitting 16 becomes easy, and the diameter of the seal portion along the axial direction is reduced. It is possible to reduce the size almost uniformly. Therefore, the sealing between the pair of liquid chambers by the partition member and the sealing of the liquid chambers to the outside as in the related art do not become insufficient.

In the present embodiment, the second cylindrical portion 16C, which is the distal end side in the direction of press-fitting the bracket 12 with the outer cylinder fitting 16 sandwiching the engaging portion 16E along the axial direction, is press-fitted into the bracket 12. The diameter is smaller than the first cylindrical portion 16B which is the base end side in the direction. In other words, by providing a difference between these outer diameters, the base end side in the press-fitting direction is a fitting portion by press-fitting with the bracket 12, and the front end side in the press-fitting direction is sealed by the partition member 34 between the pair of liquid chambers 32 </ b> A, 32 </ b> B. As a part, it became possible to distribute the roles.

This makes it possible to eliminate the load on the sealing portion when the outer tube fitting 16 is pressed into the bracket 12.

In the above-described embodiment, the upper mounting member 2 serving as the first mounting member for the engine which is the vibration generating portion.
4 side, and a bracket 1 is attached to the vehicle body 62 as a vibration receiving portion.
Although the configuration is such that the two sides are connected, the configuration may be reversed.

In the above embodiment, the engaging portion 16
Although E is formed around the outer peripheral surface of the outer cylindrical member 16, two or more engaging portions may be formed along the circumferential direction of the outer cylindrical member 16 instead. Further, the outer diameter of the first cylindrical portion 16B and the outer diameter of the second cylindrical portion 16C of the outer cylindrical member 16 may be the same as each other.

On the other hand, in the embodiment, the purpose is to dampen an engine mounted on a vehicle. However, the anti-vibration device of the present invention is used for, for example, a body mount of a vehicle or other uses other than the vehicle. Needless to say,
The shape and size of the elastic body and the number of orifices are not limited to those of the embodiment.

[0057]

According to the vibration isolator of the present invention, as described above, the displacement of the partition member in the liquid chamber is prevented, and the sealing performance of the partition member is stabilized. The radially compact vibration damping device has been achieved by eliminating the caulking portion protruding to the outer peripheral side.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing one embodiment of a vibration isolator according to the present invention.

FIG. 2 is a side view showing an embodiment of a vibration isolator according to the present invention.

FIG. 3 is another side view showing an embodiment of the vibration isolator according to the present invention.

FIG. 4 is a cross-sectional view for explaining assembly of an embodiment of the vibration isolator according to the present invention.

FIG. 5 is a cross-sectional view showing a first vibration damping device according to the related art.

FIG. 6 is a side view showing a first vibration isolator according to the related art.

FIG. 7 is a cross-sectional view showing an outer cylinder fitting of the first vibration isolator according to the related art.

FIG. 8 is a sectional view showing a second vibration isolator according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vibration isolator 12 Bracket 16 Outer cylinder fitting (2nd mounting member) 16E Engaging part 18 Elastic body 24 Upper mounting member (1st mounting member) 32 Liquid chamber 34 Partition member

Claims (2)

[Claims] A first mounting member connected to one of the vibration generating portion and the vibration receiving portion; a first mounting member formed in a cylindrical shape and positioned on an outer peripheral side of the first mounting member and protruded toward an inner peripheral side. A second mounting member having an engaging portion in the middle in the axial direction, an elastic body interposed between the pair of mounting members, and at least a part of an inner wall formed by the elastic body; A liquid chamber in which liquid is sealed, and an outer peripheral side is disposed in the liquid chamber while being positioned in the axial direction by being engaged with the engaging portion of the second mounting member, and the liquid chamber is formed into a pair of small liquid chambers. A partition member having an orifice for partitioning and communicating the pair of small liquid chambers; and a second member connected to the other of the vibration generating section and the vibration receiving section,
And a bracket in which the mounting member is press-fitted and the pair of mounting members and the elastic body are stored. 2. A front end of a pair of portions of the second mounting member, which sandwiches the engagement portion along an axial direction, in a press-fitting direction to the bracket from a base end side in a press-fitting direction to the bracket. 2. The vibration isolator according to claim 1, wherein the diameter is small.